Update README.md

Author: jurajsomorovsky

README.md

@@ -1,2 +1,12 @@
 # EccPlayground
-Simple application for playing with elliptic curves
+Simple application for playing with elliptic curves.
+Supports elliptic curves over finite fields, with  Weierstrass equation. 
+
+## Build
+```bash
+$ mvn clean package
+$ java -jar target/EccPlayground-1.0-SNAPSHOT-jar-with-dependencies.jar 
+```
+
+## Overview
+![GitHub Logo](/doc/example.png)